Pysmarty2

- Don't pin to a specific `pymodbus` version, instead allow any version up to `4.0.0` (excluding).

**Full Changelog**: https://github.com/martinssipenko/pysmarty2/compare/v0.10...v0.10.1

- Updated references to be `smarty2`
- Updated readme
- Added gitignore

**Full Changelog**: https://github.com/martinssipenko/pysmarty2/compare/v0.9...v0.10

- Forked from https://github.com/z0mbieprocess/pysmarty
- Updated library code to support `pymodbus` version `3.x`